我有這樣的一個表:MySQL的左連接不止一次
數據:
id | state | more
-----------------
1 | 1 | ...
2 | 2 | ...
3 | 1 | ...
,並指出:
id | state
----------
1 | Open
2 | Closed
如果我做
SELECT states.state FROM data LEFT JOIN states ON data.state = states.id
我收到
state
-----
Open
Closed
Open
到目前爲止這麼好。我所試圖做的(沒有成功),如果我有這樣的一個表中的數據:
id | state | state2 | more
--------------------------
1 | 1 | 2 | ...
2 | 2 | 1 | ...
3 | 1 | 1 | ...
如何獲得:
state | state 2
----------------
Open | Closed
Closed | Open
Open | Open
什麼是「更多」? – Strawberry